patches for DPDK stable branches
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From: Ashok Kaladi <ashok.k.kaladi@intel.com>
To: jerinj@marvell.com, thomas@monjalon.net
Cc: dev@dpdk.org, s.v.naga.harish.k@intel.com,
	erik.g.carrillo@intel.com, abhinandan.gujjar@intel.com,
	stable@dpdk.org
Subject: [PATCH 2/2] ethdev: fix race condition in fast-path ops setup
Date: Mon, 20 Feb 2023 00:08:39 -0600	[thread overview]
Message-ID: <20230220060839.1267349-2-ashok.k.kaladi@intel.com> (raw)
In-Reply-To: <20230220060839.1267349-1-ashok.k.kaladi@intel.com>

If ethdev enqueue or dequeue function is called during
eth_dev_fp_ops_setup(), it may get pre-empted after setting
the function pointers, but before setting the pointer to port data.
In this case the newly registered enqueue/dequeue function will use
dummy port data and end up in seg fault.

This patch moves the updation of each data pointers before updating
corresponding function pointers.

Fixes: c87d435a4d79 ("ethdev: copy fast-path API into separate structure")
Cc: stable@dpdk.org

Signed-off-by: Ashok Kaladi <ashok.k.kaladi@intel.com>

diff --git a/lib/ethdev/ethdev_private.c b/lib/ethdev/ethdev_private.c
index 48090c879a..a0232c669f 100644
--- a/lib/ethdev/ethdev_private.c
+++ b/lib/ethdev/ethdev_private.c
@@ -270,17 +270,17 @@ void
 eth_dev_fp_ops_setup(struct rte_eth_fp_ops *fpo,
 		const struct rte_eth_dev *dev)
 {
+	fpo->rxq.data = dev->data->rx_queues;
 	fpo->rx_pkt_burst = dev->rx_pkt_burst;
+	fpo->txq.data = dev->data->tx_queues;
 	fpo->tx_pkt_burst = dev->tx_pkt_burst;
 	fpo->tx_pkt_prepare = dev->tx_pkt_prepare;
 	fpo->rx_queue_count = dev->rx_queue_count;
 	fpo->rx_descriptor_status = dev->rx_descriptor_status;
 	fpo->tx_descriptor_status = dev->tx_descriptor_status;
 
-	fpo->rxq.data = dev->data->rx_queues;
 	fpo->rxq.clbk = (void **)(uintptr_t)dev->post_rx_burst_cbs;
 
-	fpo->txq.data = dev->data->tx_queues;
 	fpo->txq.clbk = (void **)(uintptr_t)dev->pre_tx_burst_cbs;
 }
 
-- 
2.25.1


  reply	other threads:[~2023-02-20  6:08 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-20  6:08 [PATCH 1/2] eventdev: fix race condition in fast-path set function Ashok Kaladi
2023-02-20  6:08 ` Ashok Kaladi [this message]
2023-02-20  6:57   ` [PATCH 2/2] ethdev: fix race condition in fast-path ops setup fengchengwen
2023-02-21  7:24     ` Ruifeng Wang
2023-02-21 17:00       ` Stephen Hemminger
2023-02-22  1:07         ` fengchengwen
2023-02-22  9:41           ` Ruifeng Wang
2023-02-22 10:41           ` Konstantin Ananyev
2023-02-22 22:48             ` Honnappa Nagarahalli
2023-02-23  1:15               ` Stephen Hemminger
2023-02-23  4:47                 ` Honnappa Nagarahalli
2023-02-23  4:40             ` Honnappa Nagarahalli
2023-02-23  8:23               ` fengchengwen
2023-02-23 13:31                 ` Konstantin Ananyev
2023-02-25  1:32                   ` fengchengwen
2023-02-28 23:57                   ` Honnappa Nagarahalli
2023-02-20  7:01   ` fengchengwen
2023-02-20  9:44   ` Konstantin Ananyev
2023-03-03 16:49   ` Ferruh Yigit
  -- strict thread matches above, loose matches on Subject: below --
2023-02-20  6:06 [PATCH 1/2] eventdev: fix race condition in fast-path set function Ashok Kaladi
2023-02-20  6:06 ` [PATCH 2/2] ethdev: fix race condition in fast-path ops setup Ashok Kaladi

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